public static void GetFieldOfView(Matrix4x4 projectionMatrix, out float fov, out float aspect)
{
float focal = projectionMatrix[1, 1];
fov = CameraUtility.Focal2Fov(focal);
aspect = focal / projectionMatrix[0, 0];
}
public static void SetFieldOfView(ref Matrix4x4 projectionMatrix, float fov, float aspect)
{
float focal = CameraUtility.Fov2Focal(fov);
projectionMatrix[0, 0] = focal / aspect;
projectionMatrix[1, 1] = focal;
}